diff --git a/doc/man1/notmuch-dump.rst b/doc/man1/notmuch-dump.rst
index 3a6d0b34..a37c337c 100644
--- a/doc/man1/notmuch-dump.rst
+++ b/doc/man1/notmuch-dump.rst
@@ -71,6 +71,8 @@ Supported options for **dump** include
             characters. Note also that tags with spaces will not be
             correctly restored with this format.
 
+    ``--output=``\ <filename>
+        Write output to given file instead of stdout.
 
 SEE ALSO
 ========